Japanese beef is special because there is sashi-Japanese word for white fat-between the layers of muscle.Because of sashi,Japanese beef looks like marbles pattern.Good marbled pattern makes the beef expensive because it makes the meat soft as it melts in the mouth.So Japanese cattle farmers try to make the beef.In most countries,beef grading is based on the fat it has.In the Us,prime beef must have 6-8% of marbled fat to meet the standard of USDA.For the Wagyu(A5),however good beef must have at least 25% of white fat.White fat makes the beef soft and more delicious but high fat content is bad for your,right? Wrong.Japanese beef is mostly monounsaturated fat that has lower"bad"cholesterol.This fat also has a very low melting point,so it seems like the beef can meat in the mouth.A steak made by top grade Japanese beef(A5) as served in some nice restaurants in TOKYO can cost 500 dollars or more.